List questions from combinatorial-proofs

Published on 11 Apr 2026 - 12:11

42

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How to show that $p^{2 \times}(n)=p^{3k\pm1}(n)$, $n \in \mathbb{N}$ partitions

Published on 15 Apr 2026 - 10:48

92

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Changing coins in change-making problem

Published on 09 Apr 2026 - 7:41

49

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How to prove domination in baseball?

Published on 09 Apr 2026 - 2:39

201

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How to prove combinatorial summations?

Published on 10 Apr 2026 - 1:08

226

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Combinatorial proof for a Stirling identity

Published on 07 May 2026 - 3:14

261

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Prove by a combinatorial argument that ${n \choose r}{r \choose s}={n \choose s} {n-s \choose r-s} $

Published on 25 Mar 2026 - 14:16

217

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Prove by a combinatorial argument that $(n-r){n \choose r}=n{n-1 \choose r}$

Published on 16 Apr 2026 - 0:28

284

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Combinatorial proof for the identity $\frac{1}{(1-x)^n}=1+\binom{1+n-1}{1}x+\binom{2+n-1}{2}x^2+\cdots+\binom{r+n-1}{r}x^r+\cdots$

Published on 17 Apr 2026 - 2:36

101

Views

Counting the number of minimal connected supergraphs of an arbitrary disconnected digraph

Published on 14 Apr 2026 - 3:19

221

Views

Two Player Strategy Game

Published on 05 May 2026 - 4:07

903

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Minimum cut on a directed graph with negative term

Published on 29 Apr 2026 - 12:49

583

Views

Combinatorial proof for Stirling number of 1st kind's generating function

Published on 10 Apr 2026 - 17:15

595

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Minimum capacity cut reduction from digraph with two edge weight sets

Published on 29 Apr 2026 - 12:49

238

Views

Combinatorial proof of this question?

Published on 12 Apr 2026 - 15:24

List Question

Combinatorial Proofs for Summations: A Possible Generalisation?

How to show that $p^{2 \times}(n)=p^{3k\pm1}(n)$, $n \in \mathbb{N}$ partitions

Changing coins in change-making problem

How to prove domination in baseball?

How to prove combinatorial summations?

Combinatorial proof for a Stirling identity

Prove by a combinatorial argument that ${n \choose r}{r \choose s}={n \choose s} {n-s \choose r-s} $

Prove by a combinatorial argument that $(n-r){n \choose r}=n{n-1 \choose r}$

Combinatorial proof for the identity $\frac{1}{(1-x)^n}=1+\binom{1+n-1}{1}x+\binom{2+n-1}{2}x^2+\cdots+\binom{r+n-1}{r}x^r+\cdots$

Counting the number of minimal connected supergraphs of an arbitrary disconnected digraph

Two Player Strategy Game

Minimum cut on a directed graph with negative term

Combinatorial proof for Stirling number of 1st kind's generating function

Minimum capacity cut reduction from digraph with two edge weight sets

Combinatorial proof of this question?

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